Search

Your search keyword '"Bourillot, R."' showing total 14 results
Start Over Author "Bourillot, R."
14 results on '"Bourillot, R."'

3. Remote Capture and Quantification of Diagenetic Products: An Outcrop Example from the Lower Jurassic in Morocco

Author

Dujoncquoy, E., Kenter, J., (0000-0003-4169-0207) Thiele, S. T., Bourillot, R., Champagne, J., Ransinangu, A., Grellier, J., Bordenave, A., (0000-0002-4383-473X) Gloaguen, R., Dujoncquoy, E., Kenter, J., (0000-0003-4169-0207) Thiele, S. T., Bourillot, R., Champagne, J., Ransinangu, A., Grellier, J., Bordenave, A., and (0000-0002-4383-473X) Gloaguen, R.

Abstract

Diagenetic modification of carbonate depositional systems is a dominant process changing their pore systems away from primary texture and responsible for their challenging multi-modal and multi-scale behavior. It is these pore system characteristics that control dynamic behavior across many scales from plug – to log – to reservoir scale. One common diagenetic product in many Middle East reservoirs is dolomite and is invoked to be associated with improved storage and excess permeability. Despite these observations, reliable spatial models of dolomite distribution are rare, especially at field or seismic scale. This paper documents how the dolomite distribution across an outcrop in Morocco was captured and validated using high resolution 3D photogrammetry combined with hyperspectral acquisition. It suggested that these, “remote” attributes can be combined and not only provide spatial rules but also point to scenarios for reconstruction of timing and process of dolomitization.

Published
2022

6. Formation of stromatolite lamina at the interface of oxygenic-anoxygenic photosynthesis

Author

Pace, A., Bourillot, R., Bouton, A., Vennin, E., Braissant, O., Dupraz, Christophe, Duteil, T., Bundeleva, I., Patrier, P., Galaup, S., Yokoyama, Y., Franceschi, M., Virgone, A., Visscher, P. T., Pace, A., Bourillot, R., Bouton, A., Vennin, E., Braissant, O., Dupraz, Christophe, Duteil, T., Bundeleva, I., Patrier, P., Galaup, S., Yokoyama, Y., Franceschi, M., Virgone, A., and Visscher, P. T.

Abstract

In modern stromatolites, mineralization results from a complex interplay between microbial metabolisms, the organic matrix, and environmental parameters. Here, we combined biogeochemical, mineralogical, and microscopic analyses with measurements of metabolic activity to characterize the mineralization processes and products in an emergent (<18months) hypersaline microbial mat. While the nucleation of Mg silicates is ubiquitous in the mat, the initial formation of a Ca-Mg carbonate lamina depends on (i) the creation of a high-pH interface combined with a major change in properties of the exopolymeric substances at the interface of the oxygenic and anoxygenic photoautotrophic layers and (ii) the synergy between two major players of sulfur cycle, purple sulfur bacteria, and sulfate-reducing bacteria. The repetition of this process over time combined with upward growth of the mat is a possible pathway leading to the formation of a stromatolite.

Published
2018
Full Text
View/download PDF

9. Evaporite control on mixed carbonated-clastic platform architecture and carbonate production: A Late Messinian case study (Sorbas Basin, SE Spain)

Author

Bourillot , R., Vennin , E., Rouchy , J.M., Durlet , C., Rommevaux , V., Kolodka , C., Knap , F., Pousserot, David, Biogéosciences [UMR 6282] [Dijon] (BGS), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC), Biogéosciences [Dijon] ( BGS ), AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements ( CR2P ), Muséum National d'Histoire Naturelle ( MNHN ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Biogéosciences [UMR 6282] (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), and Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.PG] Sciences of the Universe [physics]/Earth Sciences/Paleontology, [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology, ComputingMilieux_MISCELLANEOUS, [ SDU.STU.PG ] Sciences of the Universe [physics]/Earth Sciences/Paleontology
Abstract

International audience

Published
2009

10. Western Central Asia Evolution

Author

Barrier, E., primary, De Boisgrollier, T., additional, Brunet, M.F., additional, Bourillot, R., additional, Fursich, F., additional, Auxietre, J.L., additional, Munsch, H., additional, Mordvintsez, D., additional, Sidorova, I., additional, and Vrielynck, B., additional

Published
2013
Full Text
View/download PDF

11. The end of the Messinian Salinity Crisis in the western Mediterranean: insights from the carbonate platforms of south-eastern Spain

Author

Marie-Madeleine Blanc-Valleron, Jean-Marie Rouchy, Christophe Durlet, Emmanuelle Vennin, Antonio Caruso, Raphaël Bourillot, Biogéosciences [UMR 6282] (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Geologia e Geodesia, Università degli studi di Palermo - University of Palermo, Biogéosciences [Dijon] ( BGS ), Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique ( CNRS ), Département d'Histoire de la Terre, Paléobiodiversité et paléoenvironnements, Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Università degli Studi di Palermo, Bourillot, R, Vennin, E, Rouchy, JM, Blanc-Valleron, MM, Caruso, A, Durlet, C, Biogéosciences [UMR 6282] [Dijon] (BGS), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, and Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
Mediterranean climate, Western Mediterranean, 010506 paleontology, Evaporite, Environmental change, Settore GEO/02 - Geologia Stratigrafica E Sedimentologica, Carbonate platform, Stratigraphy, Evaporite deformation and dissolution, Messinian Salinity Crisis, 010502 geochemistry & geophysics, [ SDU.STU.ST ] Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, 01 natural sciences, Sedimentary depositional environment, Messinian Salinity Crisis, Western Mediterranean, Carbonate platforms, Evaporite deformation and dissolution, Eustasy, Return to marine conditions, chemistry.chemical_compound, Return to marine conditions, 14. Life underwater, Carbonate platforms, Eustasy, 0105 earth and related environmental sciences, Brackish water, Geology, Settore GEO/01 - Paleontologia E Paleoecologia, Water level, Oceanography, chemistry, 13. Climate action, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, Carbonate
Abstract

International audience; How the Messinian Salinity Crisis (MSC) ended is still a matter of intense debate. The Terminal Carbonate Complex (TCC) is a late Messinian carbonate platform system that recorded western Mediterranean hydrological changes from the final stages of evaporite deposition till the advent of Lago-Mare fresh- to brackish water conditions at the very end of Messinian times. A multidisciplinary study has been carried out in three localities in south-eastern Spain to reconstruct the history of TCC platforms and elucidate their significance in the MSC. Overall, this study provides evidence that the TCC formed following a regional 4th order water level rise and fall concomitant with an opening-restriction trend. It can be subdivided into four 5th order depositional sequences (DS1 to DS4) recording two phases: (1) from DS1 to DS3, a tide-dominated ooidic to oobioclastic system with stenohaline faunas developed as a result of a 70 m water level rise. During this period, the TCC developed in a shallow sea with close to normal marine salinity; (2) in depositional sequence 4, a microbialite-dominated platform system developed. This is indicative of a significant environmental change and is attributed to a 30 to 40 m water level fall in the basins under study. These restricted conditions were coeval with intense evaporite deformation and brine recycling. The synsedimentary deformation of evaporites had a major impact on platform architecture and carbonate production, affecting the Messinian series throughout south-eastern Spain at the end of the TCC history. At that time, the TCC developed in a lake with fluctuating, brackish- to hypersaline water. These findings suggest a temporary restoration of marine conditions in the western Mediterranean marginal basins due to Atlantic water influxes prompted by a global sea level rise around 5.6 Ma. Whether marine conditions extended to the entire western Mediterranean still needs to be investigated.

Published
2010
Full Text
View/download PDF

12. The role of topography and erosion in the development and architecture of shallow-water coral bioherms (Tortonian-Messinian, Cabo de Gata, SE Spain)

Author

Emmanuelle Vennin, Jean-Marie Rouchy, Vincent Rommevaux, Christian Chaix, Christophe Durlet, Antonio Caruso, Raphaël Bourillot, Christophe Kolodka, Biogéosciences [Dijon] ( BGS ), AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Département d'Histoire de la Terre, Dipartimento di Geologia e Geodesia, Università degli Studi di Palermo, Biogéosciences [UMR 6282] (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Geologia e Geodesia [Palermo], Università degli studi di Palermo - University of Palermo, Biogéosciences [UMR 6282] [Dijon] (BGS), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC), Bourillot, R, Vennin, E, Kolodka, C, Rouchy, JM, Caruso, A, Durlet, C, Chaix, C, and Rommevaux, V

Subjects
Micro-encrusters, 010506 paleontology, Settore GEO/02 - Geologia Stratigrafica E Sedimentologica, Storms, Coral, Porites, 010502 geochemistry & geophysics, Oceanography, [ SDU.STU.ST ] Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, 01 natural sciences, Sedimentary depositional environment, Bioherm, Paleontology, Storm, Back-reef erosion, Palaeotopography, 14. Life underwater, Transect, Ecology, Evolution, Behavior and Systematics, Sea level, 0105 earth and related environmental sciences, Earth-Surface Processes, Micro-encruster, geography, geography.geographical_feature_category, biology, Settore GEO/01 - Paleontologia E Paleoecologia, biology.organism_classification, Waves and shallow water, Volcano, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, Erosion, Geology
Abstract

23 pages; International audience; During the Miocene, Mediterranean shallow-water carbonates were rich in scleractinian corals, which thrive in various depositional settings. A Tortonian–Messinian bioherm belt developing in a heterozoan-dominated ramp was investigated along a 1.2 km continuous transect located in the Cabo de Gata region. The interval studied displays four depositional environments from mid-to-inner ramp, dominated by swell waves and storm energy, deposited as a single, large-scale depositional sequence during a 3rd to 4th order transgressive–regressive cycle. The bioherms grew in three phases, and were essentially composed of inplace primary frameworks. Three coral genera were the main framebuilders (Porites, Tarbellastrea and rare Siderastrea), associated with melobesioid and mastophoroid red algae and bryozoans as secondary framebuilders. The corals display five morphotypes, from a fast-growing branched type to slow-growing domal to plate morphologies, with an uncommon form of mesh Porites as the dominant morphotype. Changes in coral morphotype and composition of micro-encrusters communities reveal changes in hydrodynamics, detrital influx and perhaps nutrient levels. Bioherms architecture was driven by sea level, palaeotopography and erosion. The coral framework was affected during its development by erosion surfaces metres to tens of metres deep and hundreds of metres wide. Unexpectedly, these surfaces are better developed on the inner edges of the bioherms. This could indicate the circulation of strong bottom currents between the volcanic palaeohighs and the synoptic relief created by the buildups. Finally, a major sub-aerial erosional episode associated with increasing detrital influxes, ended bioherm development, thus allowing the colonization of the dead coral substratum by red algae.

Published
2009
Full Text
View/download PDF

13. Preservation of exopolymeric substances in estuarine sediments.

Author

Duteil T, Bourillot R, Braissant O, Grégoire B, Leloup M, Portier E, Brigaud B, Féniès H, Svahn I, Henry A, Yokoyama Y, and Visscher PT

Abstract

The surface of intertidal estuarine sediments is covered with diatom biofilms excreting exopolymeric substances (EPSs) through photosynthesis. These EPSs are highly reactive and increase sediment cohesiveness notably through organo-mineral interactions. In most sedimentary environments, EPSs are partly to fully degraded by heterotrophic bacteria in the uppermost millimeters of the sediment and so they are thought to be virtually absent deeper in the sedimentary column. Here, we present the first evidence of the preservation of EPSs and EPS-mineral aggregates in a 6-m-long sedimentary core obtained from an estuarine point bar in the Gironde Estuary. EPSs were extracted from 18 depth intervals along the core, and their physicochemical properties were characterized by (i) wet chemical assays to measure the concentrations of polysaccharides and proteins, and EPS deprotonation of functional groups, (ii) acid-base titrations, and (iii) Fourier transform infrared spectroscopy. EPS-sediment complexes were also imaged using cryo-scanning electron microscopy. EPS results were analyzed in the context of sediment properties including facies, grain size, and total organic carbon, and of metabolic and enzymatic activities. Our results showed a predictable decrease in EPS concentrations (proteins and polysaccharides) and reactivity from the surface biofilm to a depth of 0.5 m, possibly linked to heterotrophic degradation. Concentrations remained relatively low down to ca. 4.3 m deep. Surprisingly, at that depth EPSs abundance was comparable to the surface and showed a downward decrease to 6.08 m. cryo-scanning electron microscopy (Cryo-SEM) showed that the EPS complexes with sediment were abundant at all studied depth and potentially protected EPSs from degradation. EPS composition did not change substantially from the surface to the bottom of the core. EPS concentrations and acidity were anti-correlated with metabolic activity, but showed no statistical correlation with grain size, TOC, depth or enzymatic activity. Maximum EPS concentrations were found at the top of tide-dominated sedimentary sequences, and very low concentrations were found in river flood-dominated sedimentary sequences. Based on this observation, we propose a scenario where biofilm development and EPS production are maximal when (i) the point bar and the intertidal areas were the most extensive, i.e., tide-dominated sequences and (ii) the tide-dominated deposit were succeeded by rapid burial beneath sediments, potentially decreasing the probability of encounter between bacterial cells and EPSs., Competing Interests: EP was employed by the company 45-8 Energy. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Duteil, Bourillot, Braissant, Grégoire, Leloup, Portier, Brigaud, Féniès, Svahn, Henry, Yokoyama and Visscher.)

Published
2022
Full Text
View/download PDF

14. Microbial and diagenetic steps leading to the mineralisation of Great Salt Lake microbialites.

Author

Pace A, Bourillot R, Bouton A, Vennin E, Galaup S, Bundeleva I, Patrier P, Dupraz C, Thomazo C, Sansjofre P, Yokoyama Y, Franceschi M, Anguy Y, Pigot L, Virgone A, and Visscher PT

Subjects
Cyanobacteria chemistry, Utah, Chemical Phenomena, Cyanobacteria metabolism, Geologic Sediments microbiology, Inorganic Chemicals metabolism, Lakes microbiology, Minerals metabolism, Organic Chemicals metabolism
Abstract

Microbialites are widespread in modern and fossil hypersaline environments, where they provide a unique sedimentary archive. Authigenic mineral precipitation in modern microbialites results from a complex interplay between microbial metabolisms, organic matrices and environmental parameters. Here, we combined mineralogical and microscopic analyses with measurements of metabolic activity in order to characterise the mineralisation of microbial mats forming microbialites in the Great Salt Lake (Utah, USA). Our results show that the mineralisation process takes place in three steps progressing along geochemical gradients produced through microbial activity. First, a poorly crystallized Mg-Si phase precipitates on alveolar extracellular organic matrix due to a rise of the pH in the zone of active oxygenic photosynthesis. Second, aragonite patches nucleate in close proximity to sulfate reduction hotspots, as a result of the degradation of cyanobacteria and extracellular organic matrix mediated by, among others, sulfate reducing bacteria. A final step consists of partial replacement of aragonite by dolomite, possibly in neutral to slightly acidic porewater. This might occur due to dissolution-precipitation reactions when the most recalcitrant part of the organic matrix is degraded. The mineralisation pathways proposed here provide pivotal insight for the interpretation of microbial processes in past hypersaline environments.

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results